{"instruction": "You are an expert in named entity recognition. Please extract entities that match the schema definition from the input. Return an empty list if the entity type does not exist. Please respond in the format of a JSON string.", "schema": ["Chemical"], "input": "While older methods such as two - dimensional polyacrylamide electrophoresis continued to be used , a variety of more in - depth MS - based approaches including both label ( ICAT , iTRAQ , TMT , SILAC , SILAM ) , label - free ( label - free , MRM , SWATH ) and absolute quantification methods , are rapidly being applied to neurobiological investigations of normal and diseased brain tissue as well as of cerebrospinal fluid ( CSF ) ."}
{"Chemical": ["polyacrylamide"]}